Hildebrandt most recently served as a partner with global business law firm Norton Rose Fulbright, with a practice focused on corporate governance, energy transactions, and mergers and acquisitions. Prior to that position, she was SVP, general counsel, and secretary of Enterprise Products Partners, a publicly-traded pipeline partnership and provider of midstream energy services from 2010 to 2014 and held various other roles at Enterprise, including as VP, deputy general counsel, and assistant secretary from 2004.

In its latest quarterly report, Archrock said the SEC has been conducting an investigation in connection with certain previously disclosed errors and possible irregularities at one of its former international operations. The company disclosed the investigation in its annual report in February 2017.

Both Archrock and Exterran, which spun off from Archrock in 2015, said they are cooperating with the SEC in the investigation. "Among other things, we have been assisting Exterran in responding to a subpoena for documents related to the restatement of prior period consolidated and combined financial statements and related disclosures and compliance with the U.S. Foreign Corrupt Practices Act, which are also being provided to the U.S. Department of Justice at its request," the company stated in its latest quarterly report.